kt 150

[Andy Le Blanc]

just stumbled over new sensor kt 150

70 Watts plate dissipation

the heater needs 2 A

jazzed about the shape of the envelope

I think there's a tung sol labeling too

can't wait to try a pair out

[Andy Le Blanc]

data sheet

[Colossal]

Got any plans for one Andy? Single Ended mayhem? Push pull Tesla coil?

[Leo_Gnardo]

Fast and bulbous! Bulbous I said, and tapered too!

The hi fi nuts have been alternately fawning over these and rejecting them on Audio Asylum. One wag says "a solution in search of a problem." One of these days I'll have to get a pair to try out. Is there a source other than "no discounts" New Sensor?

[Andy Le Blanc]

I've been farting around with a notion...

Simple P-P, BIG IRON... I figure 100w but simple vintage volume and tone.

I've got an old JBL E-120, 1-12 combo, along those lines...

[Andy Le Blanc]

Fast and bulbous! Bulbous I said, and tapered too!

"a solution in search of a problem."

love it... way too much fun, a tube is a tube, always dig the way huge dissipation... lol.

[matt h]

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[es345]

I have done some KT150 tests during the last year published here http://www.diyaudio.com/forums/tubes-va ... kt120.html

[pdf64]

the rather ridiculous (and finicky) driver demands pretty much mean if you're expecting them to perform like a pair of 6550's, you're going to need to throw in a big/ballsy enough dedicated driver stage

matt, would you mind updating me on the driver demands mentioned?
Thanks

[Leo_Gnardo]

I've been farting around with a notion...

Simple P-P, BIG IRON... I figure 100w but simple vintage volume and tone.

I've got an old JBL E-120, 1-12 combo, along those lines...

An old fart at play, eh? hmmmph aharumph!

Found out the hard way some 30 years back, one sure fire method to wreck a nice JBL 12 is slam a 100W amp thru it at full rip. Share the power across 2 speakers at least. Saw Dicky Betts awhile back, 100W Marshall & JBL loaded 4x12. Sounded sweet as could be and not much chance of wrecking a speaker.

Matt h's suggestion on a proper drive stage is excellent advice. You could follow the usual Fender/Marshall style inverter with a pair of pokey triodes, 12AU7 or 6SN7 for instance. I reckon the '150 would make a dandy bass amp tube.

es345 thanks for the link and the research! I had a brief look, will have to read in depth later.

[matt h]

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[Bob S]

Interesting Andy. I gots a pair of KT 120's I was eyeballing last night.
Hmmm - Soon. ish. Got a lot on the go right now.
Bon chance with those bad boys.
Bob

[M Fowler]

I have done some KT150 tests during the last year published here http://www.diyaudio.com/forums/tubes-va ... kt120.html

Very interesting reading through all the threads and links, thank you.

I run the KT120 tubes for MI amp but I want to get a PT that has separate plate and screen supply so I keep the screen voltage safely lower. More experimenting needed on my part but I'm not technically inclined like you.

Mark

[pdf64]

the 50k max grid leak for fixed bias is a red flag to me

I think that the 6550 has the same limiting value on that?

I remember someone putting forward the idea that the grid resistance limiting value is most pertinent at max plate dissipation.
Such that as the plate dissipation is reduced, the grid resistance can be increased.

The KT88 info sheet seems to comply with that rationale http://www.mif.pg.gda.pl/homepages/fran ... k/KT88.pdf

I want to get a PT that has separate plate and screen supply so I keep the screen voltage safely lower

I think that the 'typical operating conditions' of the tube info sheets were often based on separate supplies from the same PT winding, achieved by having a cap input filter after the plate supply rectifier, and a choke input filter after the screen supply rectifier (which might only be half wave rectified). Thereby giving good regulation on the screen supply, where it's most beneficial.

[matt h]

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